Centrifugal attritional pulverizer.



JLH. & J. MACARTNEY.

CENTRIFUGAL ATTRITIONAL PULI/ERIZER.

APPLICATION FILED JAN-10.1911

Patented Jan. 15, 1918.

2 SHEETS-SHEET I- me "hey I A TTOR/VEV 1. H. 8;]. MACARTNEY. CEHTRIFUGAL ATTRITIONAL PULVERI ZER.

APPLICATION FILED JAN. 10. I911- ]Pmtentedl Jan. 15, 191.8.

2 SHEETSSHEET 2.

wmms

SS PATENT @FFTQE dOHN H. MAC-ARTNJEY AND JACK MACARTNIEY, 0]? LOS ANGELES, @ALIFORNIA.

Specification of Letters Patent.

Patented Jan. is, rare.

Application filed January 10, 1917. Serial No. 141,689.

To all whom it may concern:

,Be it known that we, JOHN H. MAOART- NEY and JACK MAGARTNEY, both citizens of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Centrifugal Attritional Pulverizer, of which the following is a specification.

This invention relates to a machine adapted to reduce to fineness such materials as ore, clay, quartz, silica, and the like.

An object of the invention is to provide a machine of this kind which will operate at comparatively low speed with high efficiency to reduce to any required fineness broken materials by a grinding action of the pieces of material upon each other with minimum wear upon the machine and with maximum range of product.

The invention relates to the construction of the grinding chamber formed by oppositely rotating opposite recessed heads mounted face to face and relatively rotatable, and an object to so construct the chamber that one or each of the heads impels in the direction of its rotation a portion of the passing material with minimum jamming of the material, so that the grinding is freely efiected by an attrition of the drawings, the subjoined detailed description and the appended claims.

The accompanying drawings illustrate the invention.

Figure 1 is an elevation, partly in section, on a straight vertical line, of a machine constructed in accordance with this invention.

2 is a detached elevation, partly in section, of the hollow centrally ported shaft detached.

Fig. 3 is an enlarged detail of the opposing rims of the appositely concaved grinding heads.

F 4 is a plan of said machine partly in sectlon. I

Fig. 5 is a fragmental side elevation of the case or housing detached.

The hollow material holding members are shown as concave heads 1 and 2 that have apposite recessed faces 3 and 4: forming the grinding chamber 4. The heads 1 and 2. .are essentially panshaped, and are outwardly deepened from near the center to near the periphery, and are mounted hollow face to hollow face and revolving, as desired, on the same axis, in opposite'directions', or in the same direction at difl'erent speeds, or one may be stationary while the other revolves.

By reason of the outwardly increased meeting surfaces of the relatively moving "depth of the grinding chamber, the material bodies of material.

Another feature of novelty resides in a gradual drawing together of the top and bottom walls of the chamber near theperipheral discharge which is provided through the medium of the space between the rims of the opposite recessed rotating heads.

An object of the invention is to provide a pulverizer that will operate with great efficiency and without jamming or clogging in either wet or dry processes of pulverizing.

A further object of the invention is to provide a machine in which the wear on the machine is minimized and-the pul'verizing is edected b contact of relatively movin portions of t e material to be pulverized an in which the material is quic ly discharged when it reaches the fineness required; so that although the machine is adapted to grind material to exceeding fineness for cyaniding and flotation rocesses of recovery, it mayalso be reduce to a nearly uniform mesh of any size.

Other objects, advantages and features of novelty may appear from the accompanying freely travels to and banks up at the periphcry of the chamber and thus the grinding is efiected by abrasion of the ieces upon each other as they fly outward y in horizontal planes from the centrifugal impulse imparted to them by the lower revolving'head, and they are thus measurably prevented from abrading the heads, the pieces partake of the rotary motion while being subject to the outward propulsion of centrifugal force and grlnding upon each other en mar e at the periphery of the chamber.

The lower head 1 has a removable finished rim 5 and the upper head 2 has an apposite removable finished rim 6. These rims form a vertical peripheral wall against which the material will be held by centrifugal force in the operation of the pulverizer. The head 1 is fixed upon the hollow shaft 7 by the key 1 in the key way 7, and the bore a of said shaft 7 terminates Within the chamber formed by said'heads and is arranged to admit material to said chamber through lateral ports. g

Said shaft is mounted in the frame 8 by means of a step bearing 9 and an upper bearing 10 connected to the frame. Said shaft is driven by means of a pulley 11 fixed thereto by a key 12 engaged by screw 13. The head 2 is provided with a hollow arbor 14 journaled by means of the brasses or babbitt bearin s 15, rotated by means of pulley 17 fixed to said arbor 14. Said hollow arbor is supported by an antifriction thrust-bearing comprising a raceway 18 fixed to the frame 8 and raceway 19 fixed by cap screws 20 to the hollow arbor 14 and antifriction means in the form of balls 21 in said raceways. This bearing is arranged entirely outside of the head 2 and the hollow arbor, and also outside of a housing containing both heads and constructed of an outer annular rim wall 22 having an inside annular deflector 23, and

top and bottom annular plates 24, 25, se-

cured to said wall 22 by screws 26, the upper plate 24 being fixed by screws 27 to the raceway 18 and the lower plate 25 being fixed by any suitable means as rivets 28 to-a reinforcing ring 29 surrounding the down-t wardly extending hub 30 of the lower head 1. Means are provided for adjusting the lower head 1 toward and from the upper head 2 and in the form shown the same consists of threads 31 on the shaft 7 below the bottom plate 25 of the housing, and adjust- 7 ing or set nuts 32, 33, on, the threaded portion 31 to support the hub 30 which rests upon the upper set nut 33. By adjusting the nuts 32, 33, up or down, the annular peripheral discharge orifice 34 may be narrowed or widened. Said discharge orifice 34 extends as narrow slit between the rims 5, 6 entirely around the rotor formed by heads 1, 2, and rims, and ma a adjusted I l to a minute width.

' The rims 5, 6 are fixed to their respective beads by cap screws 35 extendin through the outer edges of the heads and screwed into the rims 5, 6. Packin held invplace by means of a packing ring and cap screws 38 make a tight joint between the supporting shaft 7 and the lower head 1. A collar 39 is fixed by cap screws 40 to a flanged collar 41 having its flange 42 resting on the annular support 44 of the frame 8 and fixed thereto by cap screws 43. Said collar 39 extends inwardly beyond the inner surface of the hollow surface 7 and is internally threaded to receive and support the feed tube 45 that extends down through the hol low shaft 7 and terminates just below the lateralportsb thereof, which are located above the level ofthe'lower face of the rim of the upper head 2, so that material fed into the tube 45 will be delivered to the grinding chamber above the level of the 16 on the-hollow shaft 7 and is.

as rivets 49 to the'top collar 39 so as to v deliver the material to tube 45.

The housing wall 22 is fixed by bolts 50 to the frame 8 and is providedwith a discharge outlet 51 opening downwardly through the lower plate 25 of said housing. The step hearing may be of anysuitable material and is shown as provided with packing or babbitt 52 and the anti-frictionplate 53.

The frame may be constructed with three legs having base members 54 having flanges 55 provided with holes a; through which .bolts or cap screws, not shown, may be inserted to fasten the-frame to the floor. The legs 57 are bent over inwardly at their upper ends and extend radially toward the center in the form of top beams 58 fixed by cap screws 59 to the lower raceway 18. The upper portions (if said legs are bent upward from the beams to form legs 60 of a stand fixed by cap screws til to the annular support 44. a

The heads 1 and are provided with ex ternal fan blades 62, 63 extending from the center toward the rim and adapted to expel air from the center tcward the rim ofthe housing and out through the outlet 51, The

In practical operation, the pulleys and grindingheads may be driven in the direc I tion indicated by the arrows thereon, the lower head 1 and pulley 11 rotating in the one direction and the upper head 2 and pulley 1'? rotating in the other direction. The material being fed into the hopper descends through the tube 45 and is discharged by the force of gravity and by centrifugal force through the ports 45 into the grinding chamher 4 formed by the concavities 3 and 4 with the result that the material responsive to the impulses of the rotating shaft 7 is received by the head 1 rotating the same direction, and travels outward filling the outer portion of the recess 3, and covering the bottom of the inner portion.

Centrifugal force holds the material against the rim walls 5, 6 but the outer oblique edges a, b, of the concave inner faces of the heads converge toward the vertical walls formed by rims 5, 6, so that centrifugal force causes the material to be fed toward the medial spaces between the heads to efi'ect grinding without jamming or clogging.

As the material is fed into the chamber 4 such chamber may become entirely filled and in case the heads are reversely rotated the material in the independent recesses 3 and 4 respectively will take on the opposite rotation of the heads 1 and 2 respectively, so that at or about the level of the discharge slit 34 there will be a division between the contents of the chamber, the material in the lower head revolving in the direction of the arrows on said lower head and the upper pulley, and the material in the upper head revolving in the reverse direction as indicated by the arrows on the upper head and the lower pulley.

As a result of this. operation the reverselyrevolving masses of material at the central plane near the rim walls 5, 6 grind one another and the air contained in the interstices 'of the mass is driven outward by centrifugal force and expelledthrough t e peripheral discharge slit 34 carrying with it the fine particles which are also centrifugally driven and immediately taken up by the air as they become ground off and are carried by the air to the'outlet 51 from whence they may be conducted by any suitable means to any suitable receptacle, not shown.

"Whenever it is desired to gain access to the heads the upper cap screws 26 and the cap screws 50 may be removed and the housing wall 22 lowered out of the way. Then the cap screws 35 may be withdrawn from the rims of the heads.

The rim members 5 and 6 may be made of very hard and substantial metal capable of resisting wear and they may be replaced in case of wear by removing the cap screws 35, then slipping out the rims 5, 6 and replacing them with new.

It is obvious that belts or other driving means not shown may be arranged as desired and that the opposite recessed grind-' ing heads 1 and 2 may be thereby rotated as desired, simultaneously in the same direction, or either independently with the other at rest and that the most rapid grindingwill occur when the heads are oppositely rotated.

A. manhole 63 in the housing wall 22 and a removable manhole cover 64 provide access to the dust. chamber 65 in the housing.

In the wet process of pulverizing, water will be fed into thehopper with the material t e pulverized and will be thrown out by curved toward each other near the periphery.

2. A pulverizer comprising two hollow members forming a chamber and separated to form between them a peripheral outlet from said chamber, means to rotate said members, and means to supply material to the chamber between said members; said chamber being outwardly depended and terminated peripherally by separated vertical walls that stop the material on its outward course.

3. A pulverizer comprising two hollow members forming a chamber and separated to form between them a peripheral outlet from said chamber, means to oppositely rotate said members, and means to supply material to the chamber between said members; said chamber being outwardly deepened above and below the central horizontal plane to near the periphery and then gradually reduced in depth to the periphery and terminated by vertical walls formed by the rims of the chamber to stop the outward flow of the material above and below said central horizontal plane.

4. The combination with a frame, a step bearing and an upper bearing connected to the frame; of a shaft mounted in said bearings and having a bore in its upper portion and lateral ports at the lower end of such bore; a head fixed to the shaft and recessed on its upper face below the level of said ports; a head recessed on its under face and having a hollow arbor extending upward therefrom and journaled on said shaft; means connected with the hollow arbor to rotate the upper head and means connected to the shaft to rotate the lower head; a top collar connected to the frame and a tube connected to said top collar and extending down within the bore of the shaft to allow material to be delivered there through to the orts without contact with the walls of the ore.

In witness whereof, we have hereunto set our hands at Los Angeles, California, this 30th day of December 1916.

JOHN H. MACARTNEY. JACK MACARTNEY. Witness:

James R. TOWNSEND. 

